在小鼠植入前胚胎中,对5-基甲基细胞素的复制依赖性损失
1Howard Hughes Medical Institute (HHMI), Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Science (New York, N.Y.)
|September 24, 2011
概括
全球DNA甲基化清除在早期发展涉及Tet蛋白. 虽然Tet3在胚胎细胞中促进了5-甲基细胞因子转化为5-基甲基细胞因子的转化,但在植入前的发育过程中,其随后的损失是一个被动的,依赖于复制的过程.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发育生物学 发展生物学
- 基因组学就是基因组学.
背景情况:
- 全球消除DNA甲基化发生在杂胞体和原始生殖细胞中.
- 蛋白催化了5-甲基细胞因子 (5mC) 转化为5-基甲基细胞因子 (5hmC) 的过程.
- 最近,已发现Tet3参与了囊胞中5mC转化为5hmC的过程.
研究的目的:
- 为了研究Tet蛋白在DNA甲基化清除中在早期发育过程中的作用.
- 确定在植入前发育过程中5-基甲基细胞素 (5hmC) 损失的机制.
主要方法:
- 线粒染色体的免疫覆盖从植入前胚胎传播.
- 在胚胎发育过程中对5-基甲基细胞素 (5hmC) 模式的分析.
主要成果:
- 在胚胎胚胎中,与父基因组相关的5-基甲基氨酸 (5hmC) 在植入前发育过程中逐渐丢失.
- 转化5-甲基细胞氨酸 (5mC) 到5hmC在zygotes是一个酶催化过程.
- 在植入前发育过程中5hmC的损失似乎是一个依赖于DNA复制的被动过程.
结论:
- 泰特蛋白,特别是泰特3,参与DNA脱甲基化的初始阶段,通过氧化5-甲基细胞因子 (5mC) 到5-基甲基细胞因子 (5hmC).
- 在植入前的发育过程中,随后的5hmC损失不是一个活跃的酶过程,而是通过DNA复制的被动稀释.
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